/*
 * Copyright 2013-2019 Xia Jun(3979434@qq.com).
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 ***************************************************************************************
 *                                                                                     *
 *                        Website : http://www.farsunset.com                           *
 *                                                                                     *
 ***************************************************************************************
 */
package com.workcell.workdata.im.repository.specification;


import com.workcell.workdata.im.entity.MicroServer;
import org.apache.commons.lang3.StringUtils;
import org.springframework.data.jpa.domain.Specification;

import javax.persistence.criteria.CriteriaBuilder;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.Predicate;
import javax.persistence.criteria.Root;
import java.util.ArrayList;
import java.util.List;

public class MicroServerSpecification implements Specification<MicroServer> {


    private final String name;

    private final long index;

    private MicroServerSpecification(long index ,String name) {
        this.name = name;
        this.index = index;
    }


    @Override
    public Predicate toPredicate(Root<MicroServer> root, CriteriaQuery<?> query, CriteriaBuilder builder) {

        List<Predicate> predicatesList = new ArrayList<>();

        predicatesList.add(builder.gt(root.get("id").as(Long.class), index));

        if (StringUtils.isNotBlank(name)){
            predicatesList.add(builder.like(root.get("name").as(String.class),  "%" + name + "%"));
        }

        query.where(predicatesList.toArray(new Predicate[0]));

        query.orderBy(builder.desc(root.get("id").as(Long.class)));

        return query.getRestriction();
    }


    public static MicroServerSpecification search(long index ,String name) {
        return new MicroServerSpecification(index,name);
    }


}
